PCV hookup for 66 GS

I bought a car with an Edelbrock 750 , and found an original Carter AFB 4080S, however I can't figure how to hook up the PCV connection to the carb. The Edelbrock has a nipple on the front where the PCV hose connects. The Carter AFB does not have this connection,. however, has as threaded 1/2" hole in the back of the carb. I assume that is where the PCV connection goes? If so I need a threaded fitting with a nipple to attach the PCV hose. If anyone could provide me some information I would be grateful.p

 

Thanks Larry I'll give it a try.

 

Steve

You didn't say if you had power brakes. If so you will need the "T" fitting also, as the vacuum for the power brakes also come off the port on the back of the carter.

Al
:beer

 

Al, my power brake booster is fed from a brass plug in the back of the manifold, so I don't think I'll need the T fitting. But I do have another question for you or other 65-66 GS owners, I noticed a vaccum port in the airhorn area in the back choke side of the AFB. I was wondering what that port was connected to?

Thanks

 

Hi Steve

The port you are talking about on the carb airhorn is part of the choke setup.
There should be a steel tube from the rear bottom of the right exhaust manifold, which hooks up to the port via a small section of rubber hose.
On the front bottom side of the exhaust manifold, the tube comes out and connects to the choke housing, on the carb. The old hi-tech HOT air choke!
For the pcv hose, since you have the vac. from the manifold you can use a fitting on back of carb and connect to your pcv by hose.

Hope this helps

Al:beer :3gears:

 

Al, thanks for the info. I've got the PCV part figured out but am still lost on the choke hook-up. Do I need to fabricate a tube from the bottom of the exhaust manifold to the vacum port on the airhorn, and does this tube go all the way to the choke stove? In other words is it a one piece steel tube?

Thanks

 

Steve
There should be a tube IN the exhaust manifold, you should be able to feel it on the fire wall side and see it on the front side.
If you have the manifold off the engine, it should be very easy to see.

Al
p.s. thankfully it isn't the left manifold.

 

You may be better off using an electric choke kit. Those tubes usually crack inside the manifold and allow exhaust to get sucked into the choke and cause trouble. Electric chokes work better anyway.:bglasses:

 

Thanks guys. I don't have the manifold off and am not sure of the correct routing of the tubing, etc. I am thinking on an electric choke. Do you guys know if an Edelbrock electric choke will work on the old Carter AFB?

 

The Edelbrock may fit yours. I bought a kit from NAPA for mine, it comes with an electronic control module that compensates for the engine block temperature automatically. It only cost me around $45. It made a huge difference in the warm up performance. :bglasses:

 

Ok guys, I have another question, If I put an electric choke cap on my choke, won't there be a vaccum leak where the choke threaded fitting goes?

 

I've often wondered that myself. My thought is that heated air normally goes through that anyway, so by capping it off you would have to compensate by leaning out the idle mixture slightly.

I don't think a source of unfiltered air entering the carb is a good idea if you leave it uncapped.:bglasses: